<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <!-- 添加商品 -->
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog"
            >添加分类</el-button
          >
        </el-col>
      </el-row>
      <!-- 表格 -->
      <tree-table
        class="TreeTable"
        :data="catelist"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        show-index
        index-text=""
        border
      >
        <!-- 是否有效 -->
        <template slot="isok" slot-scope="scope">
          <i
            class="el-icon-success"
            v-if="scope.row.cat_deleted === false"
            style="color: lightgreen"
          ></i>
          <i class="el-icon-error" v-else style="color: red"></i>
        </template>
        <!-- 排序 -->
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag type="success" size="mini" v-if="scope.row.cat_level === 1"
            >二级</el-tag
          >
          <el-tag type="warning" size="mini" v-if="scope.row.cat_level === 2"
            >三级</el-tag
          >
        </template>
        <!-- 操作 -->
        <template slot="opt" slot-scope="scope">
          <el-button
            size="mini"
            type="primary"
            icon="el-icon-edit"
            @click="showEditDialog(scope.row.cat_id)"
            >编辑</el-button
          >
          <el-button
            size="mini"
            type="danger"
            icon="el-icon-delete"
            @click="removeUserById(scope.row.cat_id)"
            >删除</el-button
          >
        </template>
      </tree-table>

      <!-- 分页区域 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[3, 5, 10, 15]"
        :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      >
      </el-pagination>
    </el-card>

    <!-- 添加分类对话框 -->
    <el-dialog
      title="添加分类"
      :visible.sync="addCateDialogVisible"
      width="50%"
      @close="addCateDialogClosed"
    >
      <el-form
        :model="addCateForm"
        :rules="addCateFormRules"
        ref="addCateFormRef"
        label-width="100px"
      >
        <el-form-item label="分类名称:" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类:">
          <el-cascader
            :options="parentCateList"
            :props="cascaderProps"
            v-model="selectedKeys"
            @change="parentCateChange"
            clearable
          ></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 编辑分类对话框 -->
    <el-dialog
      title="编辑分类"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="editForm.cat_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editUserInfo"> 确 定 </el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 查询条件
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      // 商品分类的数据列表
      catelist: [],
      total: 0,
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name'
        },
        {
          label: '是否有效',
          //   将当前列定义为模板列
          type: 'template',
          template: 'isok'
        },
        {
          label: '排序',
          //   将当前列定义为模板列
          type: 'template',
          template: 'order'
        },
        {
          label: '操作',
          //   将当前列定义为模板列
          type: 'template',
          template: 'opt'
        }
      ],
      addCateDialogVisible: false,
      addCateForm: {
        cat_name: '',
        // 父级分类的ID
        cat_pid: 0,
        // 默认分类的层级
        cat_level: 0
      },
      addCateFormRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: blur }
        ]
      },
      parentCateList: [],
      cascaderProps: {
        expandTrigger: 'hover',
        checkStrictly: 'true',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      selectedKeys: [],
      editDialogVisible: false,
      editForm: {},
      editFormRules: {
        cat_name: [{
          required: true,
          message: '请输入分类名称',
          trigger: 'blur'
        },
        {
          min: 3,
          max: 10,
          message: '分类名称长度在3-10个字符之间',
          trigger: 'blur'
        }
        ]
      }
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get('categories', { params: this.queryInfo })
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败!')
      }
      console.log(res.data)
      this.catelist = res.data.result
      this.total = res.data.total
    },
    // 监听pagesize改变
    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    // 监听pagenum改变
    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage
      this.getCateList()
    },
    // 点击添加分类对话框
    showAddCateDialog() {
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    // 获取父级分类的数据
    async getParentCateList() {
      const { data: res } = await this.$http.get('categories', { params: { type: 2 } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取父级列表数据失败!')
      }
      this.parentCateList = res.data
    },
    parentCateChange() {
      console.log(this.selectedKeys)
      if (this.selectedKeys.length > 0) {
        this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
        this.addCateForm.cat_level = this.selectedKeys.length
      } else {
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
      }
    },
    addCate() {
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('categories', this.addCateForm)
        if (res.meta.status !== 201) {
          return this.$message.error('添加分类失败!')
        }
        this.$message.success('添加分类成功!')
        this.getCateList()
        this.addCateDialogVisible = false
      })
    },
    // 表单关闭的时候重置表单数据
    addCateDialogClosed() {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_level = 0
      this.addCateForm.cat_pid = 0
    },
    async showEditDialog(id) {
      const { data: res } = await this.$http.get('categories/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('查询分类信息失败!')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 修改用户并提交
    editUserInfo() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        // 可以发起添加用户请求
        const { data: res } = await this.$http.put('categories/' + this.editForm.cat_id,
          {
            cat_name: this.editForm.cat_name
          })
        if (res.meta.status !== 200) {
          this.$message.error('更新分类失败!')
        }
        this.editDialogVisible = false
        this.getCateList()
        this.$message.success('更新分类成功!')
      }
      )
    },
    async removeUserById(id) {
      const confirmResult = await this.$confirm('此操作将永久删除该分类, 是否继续?', '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)

      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }

      const { data: res } = await this.$http.delete('categories/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('删除分类失败!')
      }
      this.$message.success('删除分类成功!')
      this.getCateList()
    }
  }
}
</script>

<style lang="less" scoped>
.TreeTable {
  margin-top: 15px;
}

.el-cascader {
  width: 100%;
}
</style>
